Hyunsik Jeong
a.k.a. rbtree
| Languages | Rust, Python, C/C++, etc. |
| Good at | Reversing, Cryptography, Algorithms & Data Structures |
| Interested in | Binary analysis, Applied cryptography, Software development (including games :D) |
| Software Engineer, Kodebox Seoul, South Korea |
Oct 2018 - Dec 2019 1y 2 months |
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» Mainly developed CodeChain(Link), introducing new features, doing maintenance jobs and optimizations
» Researched on various cryptographic methods used in blockchain technologies |
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| Research Intern, Netmarble Seoul, South Korea |
Jun 2018 - Aug 2018 2 months |
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» Interned at Netmarble AI Revolution Center (NARC)
» Studied about reinforcement learning algorithms, including Actor-Critic, TRPO & PPO, and applied to game AIs |
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| Korea Advanced Institute of Science and Technology (KAIST) | Mar 2020 - PRESENT |
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» Studying for a master's degree, as a member of SysSec(Link). |
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| Pohang University of Science and Technology (POSTECH) | Mar 2015 - Feb 2020 5y |
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» Bachelor of Scince in Creative IT Engineering & Computer Science and Engineering (Magna Cum Laude) » Took a break for 1 year, from Mar 2018 to Feb 2019, to rest and do internships |
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| Seoul Science High School | Mar 2012 - Feb 2015 3y |
| Qualcomm Hexagon Decompiler | 2020 - 2021 |
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» Verified two emulators (hexagon-sim & QEMU) via differential testing » Currently looking at BinaryNinja Hexagon plugin (binja-hexagon) to decompile various Hexagon binaries |
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| Verifiable Gacha System (Link) | 2019 |
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» Built a verifiable gacha system using VRF(verifiable random function) » Users can access the whole log, including verifiable random values. Still the server only can generate random values |
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| CTFs | ||
| 2021 | Finalist, DEF CON CTF | Online |
| 2021 | 1st place, Google Capture The Flag | Online |
| 2021 | 1st place, PlaidCTF | Online |
| 2020 | 1st place, ASIS CTF Finals | Online |
| 2020 | 1st place, HITCON CTF | Online |
| 2020 | 1st place, Dragon CTF | Online |
| 2020 | 2nd place, Donjon CTF | Online |
| 2020 | 1st place, Balsn CTF | Online |
| 2020 | 1st place, Hack.lu CTF | Online |
| 2020 | 1st place, InterKosen CTF | Online |
| 2020 | 1st place, Defenit CTF | Online |
| 2020 | Finalist, DEF CON CTF | Online |
| 2020 | 4th place, PlaidCTF | Online |
| 2019 | Finalist, Google Capture The Flag | Online support |
| 2019 | 1st place, Hack.lu CTF | Online |
| 2019 | Finalist, DEF CON CTF | United States |
| 2019 | 3rd place, PlaidCTF | Online |
| 2019 | Finalist, 0CTF/TCTF | China |
| 2019 | 1st place, Codegate CTF (University division) | Seoul, South Korea |
| 2019 | 1st place, Harekaze CTF | Online |
| 2018 | Finalist, CODE BLUE CTF | Japan |
| 2018 | Finalist, Google Capture The Flag | United Kingdom |
| 2018 | Finalist, DEF CON CTF | Online support |
| 2018 | 4th place, Plaid CTF | Online |
| 2018 | 4th prize, Samsung Capture the Flag | Seoul, South Korea |
| 2017 | Finalist, HITCON CTF | Online support |
| 2017 | Finalist, DEF CON CTF | United States |
| 2017 | 4th place, SECUINSIDE CTF | Online |
| 2017 | 4th prize, Samsung Capture the Flag | Seoul, South Korea |
| Programming Competitions | ||
| 2017 | 26th place, ACM-ICPC Asia Daejeon Regional | Daejeon, South Korea |
| 2016 | 10th place, ACM-ICPC Asia Daejeon Regional | Daejeon, South Korea |
| 2016 | 5th prize, Samsung Collegiate Programming Cup | Seoul, South Korea |
| 2014 | Gold prize, Korean Olympiad in Informatics (High school division) | Suncheon, South Korea |
| pbctf Author | 2020 | ||||
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| BingoCTF (POC 2020) Author | 2020 | ||||
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| Cyber Operations Challenge (사이버작전 경연대회) Author | 2020 | ||||
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| POSTECH Programming Competition (PPC) Problem Author | 2018 - 2019 | ||||
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